04 July 2023

Principles of Superheterodyne and Heterodyne:

The superheterodyne receiver is the most common configuration for radio communications. Its basic principle of operation is the translation of all received channels into an intermediate frequency (IF) band where weak input signals are amplified before being applied to a detecto

Heterodyne and superheterodyne principles:

A superheterodyne receiver combines amplification with frequency mixing and is the most popular architecture for a microwave receiver. Heterodyne means mixing two signals of different frequencies together, resulting in a "beat" frequency.


Luminance signal, monochromatic signal, chrominance signal:

The luminance (luma) signal carries information about the brightness or brightness of the video scene and the chrominance signal carries color or chrominance information. Since the human eye's ability to perceive detail is most acute when viewing white light, light transmission carries the impression of fine detail. Luminance as different shades of light in grays while chroma are different hues of color. Colors have intensity while light has brightness. We see color in images because of light. In the absence of light, in total darkness, we do not see any colors.

The luminance signal is composed of a ratio of 30% red, 59% green and 11% blue from the color signal. This combined output becomes the luminance (brightness/monochromatic) signal. It is written as Y. RGB signal derived from camera or telesign by matrix or summation

A monochrome signal (Y signal) is commonly known as a black and white or grayscale signal. Black-and-white displays often use colored backlights such as green, blue, or orange.

A chrominance signal (chroma or C signal) is a signal used in video systems to convey image color information separately from the accompanying luma signal (Y signal)

The chrominance (chrome) signal in NTSC systems is an alternating current of precisely defined frequency (3.579545 ± 0.000010 MHz), which allows accurate recovery at the receiver even in the presence of strong noise or interference. The PAL (Phase Alternation Line) system is similar to the NTSC system in that the chrominance signal is simultaneously amplitude modulated to carry the color saturation (pastel-versus-vibrant) direction and phase modulated to carry the hue direction.

#Signal

Maximum speed of electromagnetic waves "c":

Abstract

The relationship between the speed of light, wavelength (λ), and frequency (f) is given by the equation v = λf, where v represents the speed of the electromagnetic wave. In a vacuum, the speed of any electromagnetic wave is equal to the speed of light, c. Therefore, electromagnetic waves can have various wavelengths and frequencies as long as their product, λf, equals c.

The maximum speed of electromagnetic waves, which is commonly referred to as the speed of light. The speed of light in a vacuum is approximately 3x10^8 meters per second (m/s). This speed is denoted by the symbol "c" and is a fundamental constant of nature.

The Planck length (ℓP) and Planck time (tP) are fundamental units in theoretical physics, derived from fundamental constants of nature. The Planck length is approximately 1.61626×10^−35 meters, and the Planck time is about 5.39×10^−44 seconds. The ratio of the Planck length to the Planck time (ℓP/tP) yields a value close to the speed of light, c:

ℓP/tP ≈ c

This observation suggests a connection between the Planck scale and the speed of light, although our understanding of physics at the Planck scale is still speculative.

Maxwell's equations, developed in the 19th century, describe the behavior of electromagnetic waves and predict their propagation speed. The equation c = 1/√(ε₀μ₀) relates the speed of light to the electric constant (ε₀) and the magnetic constant (μ₀). The measured value of the speed of light, approximately 2.998x10^8 m/s, is in close agreement with this equation.

The Michelson-Morley experiment, conducted in 1887, aimed to detect the motion of the Earth through a hypothetical luminous ether medium. The experiment's results consistently showed that the speed of light was constant regardless of the Earth's motion, challenging the notion of an ether and leading to the development of Einstein's theory of special relativity.

In summary, the speed of light, which represents the maximum speed of electromagnetic waves, is approximately 3x10^8 m/s in a vacuum. It plays a fundamental role in physics and has been verified through various experiments and theoretical considerations.

Description:

According to our current understanding of physics, the speed of electromagnetic waves, including light, is about 3x10^8 meters per second in a vacuum. This value is usually called the "speed of light" and is denoted by the symbol "c".

v = λf. The speed of any electromagnetic wave in free space is the speed of light c = 3x10^8 m/s. Electromagnetic waves can have any wavelength λ or frequency f as long as λf = c.

Generally speaking, we say that light travels in waves and that all electromagnetic radiation travels at the same speed, which is about 3x10^8 meters per second through a vacuum. This is what we call "the speed of light"; nothing can travel faster than the speed of light in a gravitational field

It is worth noting that the Planck time tP is the time required for light to travel a distance of 1 Planck length = 1.62×10^-35 m in a vacuum, which is a time interval of about 5.39×10^−44 second, and the smallest possible time interval that can be measured.

The Planck length and Planck time are fundamental units in the field of theoretical physics, and they are indeed related to the speed of light in a vacuum

The Planck length, denoted "ℓP" is about 1.61626×10^−35 meters, and the Planck time, denoted "tP" is about 5.39×10^−44 seconds. These values are derived from fundamental constants of nature, such as the gravitational constant, the speed of light, and the reduced Planck constant.

The speed of light in a vacuum, denoted as "c", is about 3x10^8 meters per second. Interestingly, if you divide the Planck length by the Planck time (ℓP/tP), you get a value close to the speed of light:

ℓP/tP ≈ c.

This observation suggests a fundamental connection between the Planck scale and the speed of light.

According to Max Planck, the speed of electromagnetic waves or light is equal to one Planck length per Planck period; The limit of a photon's travel.

Planck length = 1.61626×10^−35 m.

Planck time = 5.39×10^−44 seconds.

Therefore, c = 3x10^8 m/s

Maxwell's equations, developed in the 19th century, describe the behavior of electromagnetic waves and predict their propagation speed. The equation, c = 1/√(ε₀μ₀), relates the speed of light to the electric constant (ε₀) and the magnetic constant (μ₀). The value of c was measured to be about 2.998 x 10^8 meters per second, which is very close to the currently accepted value.

The Michelson-Morley experiment, conducted in 1887, aimed to detect the motion of the Earth through hypothetical luminous ether, a medium believed to be responsible for the propagation of light waves. However, experimental results consistently show that the speed of light is constant regardless of the direction of the Earth's motion. 

This experiment played an important role in the development of Albert Einstein's theory of special relativity, which introduced the concept of a universal speed limit, the speed of light

However, the electromagnetic fields Maxwell was calculating were a medium for waves, such as waves across the surface of a pond. And the equations show that these waves travel at constant speed. Doing the sums, the speed was about 300000 km s^-1, otherwise known as the speed of light.

c = 1/ (e0m0) ^1/2 = 2.998x10^8m/s. Light is an electromagnetic wave. Maxwell realized this around 1864, when the equation c = 1/ (e0m0) ^1/2 = 2.998x10^8m/s was discovered, since the speed of light was accurately measured. By then, and its agreement with c is unlikely to be coincidental.

Michaelson and Edward W. Morley, in 1887, conducted an experiment known as the Michelson-Morley Experiment to prove that the speed of light was always the same.

What is a phase shift, and how does it relate to the frequency of the wave?

[Author ORCID: 0000-0003-1871-7803]

A phase shift refers to the displacement of a wave form in time. A complete wave cycle, also known as a period (T), corresponds to a phase shift of 360 degrees or 2π radians.

When representing a complete wave cycle in degrees (°), it can be denoted as T(deg). In this notation, T(deg) represents the angular measure of one complete cycle of the waveform in degrees.

In terms of frequency (f), which represents the number of wave cycles per unit of time, there is an inverse relationship between the period and the frequency. The period (T) is the reciprocal of the frequency (f), and the relationship can be expressed as: 

• T = 1 /f

If we express the period in degrees, T(deg), the relationship still holds

• T(deg) = 360° / f

In this case, T(deg) represents the angular measure of one complete cycle of the waveform in degrees, and it is inversely proportional to the frequency (f). Phase shifts can occur under the effects of relative velocities of observers and gravitational potential differences. 

These effects can introduce changes in the perception of time and the behavior of clocks, which may manifest as phase shifts in oscillatory systems and cause errors in time between relative clock oscillations under the effects of both relative velocities an. gravitational potential differences.

#PhaseShift #Frequency #Wave #Oscillation

01 July 2023

How do relativistic effects such as motion and gravity distort time?

Author ORCID 

Abstract:

The concepts I discussed here demonstrate an understanding of the principles and equations related to time distortion due to momentum and gravitational potential differences.

I have covered various concepts related to time distortion including Doppler Effects, phase shift, wavelength, frequency and their relationship to wave propagation. I also mentioned the application of these principles to piezoelectric crystal oscillators and how the wave distortion due to relativistic effects corresponds to the time distortion

In my explanation, I correctly stated that there is an inverse relationship between the period (T) and frequency (f) of a wave, expressed as T = 1/f. and also correctly pointed out that the wavelength (λ) of a wave is directly proportional to its period, λ ∝ T. Additionally, I have included relevant equations such as f = v/λ = 1/T = E/h, where v is the wave velocity, E is the wave energy, and h is Planck's constant.

Moreover, I discussed the concept of phase shift and the measurement of degrees (°). The total phase shift (Φ) accumulated over a period of time (Δt) can be represented as the area under a frequency versus time curve and the equation ΔΦ = Δω × Δt relates the differential phase shift (ΔΦ) to the frequency shift (Δω) and Time interval (Δt).

I have also given an example calculation for a wave frequency of 5 MHz, where a 1° phase shift corresponds to a time shift of 555 picoseconds (ps). Furthermore, I noted that a 1455.50° phase shift (equivalent to 4.04 cycles of a 9192631770 Hz wave) results in a time shift of approximately 0.0000004398148148148148 ms. or, 38 microseconds per day

Overall, my explanation incorporates various scientific principles and equations related to time distortion due to speed and gravitational potential differences. It demonstrates an understanding of wave propagation and time measurement concepts and their applications

Keywords: Doppler Effects, phase shift, gravity, piezoelectric crystal oscillators, atomic clock.

Description: 

The SI time unit of the International System of Units is defined as the time interval equal to 9192631770 vibrations of the ground state cesium-133 atom, represented as s or seconds. This means time is defined as vibrations or frequency (specifically) cesium-133 atom. Therefore, frequency represents time.

Time distortion due to speed follows the Doppler Effect, it is the change in frequency of a wave as the source moves relative to an observer. So when frequency changes, energy of frequency too changes. 

Doppler shift considers the frequency change of a wave in propagation but gravitational potential difference considers the frequency change of the oscillating body.

It may be referred that if the path between a source S and an observer O is changed by an amount Δx, the phase of the wave received by O is shifted by Δn = −Δx/λ = −fΔx/c, where λ and f are, respectively, the wavelength and frequency of the disturbance and c is the speed of propagation, all measured by an observer fixed in the medium. The resulting change in observed frequency is Δf = Δn/Δt, where Δt is the time taken for the observation of the phase change. It is shown that these two statements are sufficient for the derivation of the acoustic Doppler Effect equations in all cases. The extension to the relativistic optical Doppler Effect also follows this.

This is the acoustic distortion in frequency due to speed. The wave equation shows that the energy of a wave is proportional to the square of its amplitude and its frequency. A change in the frequency of the sound wave can cause a corresponding change in the energy carried by the wave.

The Planck's equation helps us to calculate the energy when their frequency is known, as such wavelength is known, so one can calculate the energy by using the wave equation to calculate the frequency and then apply Planck's equation to find the energy. Incase of electromagnetic waves, Planck's equation shows us how frequency of the wave is proportional to energy of the wave.  

However, in case of gravitational effects, gravity exerts a mechanical force on any object that deforms the object and pushes on the surrounding atoms. Using gravity, energy is obtained by the so-called piezo method, which converts mechanical stress into electrical energy. 

When mechanical stress is applied to a piezoelectric crystal, the structure of the crystal is deformed, the atoms push around and the crystal conducts an electric current. It occurs when motion or mechanical energy is converted into electrical energy due to crystal deformation. Piezoelectric materials are materials that can generate electricity due to mechanical stress. The mechanical stress of a piezoelectric crystal is greatest in the ground state.

In the case of a gravitational potential difference, there is less gravitational stress on a piezoelectric crystal, which correspondingly reverses the deformation of the structure, thereby pushing the atoms around, causing the crystal to conduct less electric current than in the ground state.

Oscillatory systems with relative velocity or gravitational potential difference experience phase shifts, causing wave energy loss and errors in clock time readings. 


Therefore, both acoustic distortion and electromagnetic distortion at their respective frequencies due to motion correspond to distortions of the corresponding wave energy.


However, Doppler shift considers the frequency change of a wave in propagation but gravitational potential difference considers the frequency change of the oscillating body.


Experiments made on piezoelectric crystal oscillators show that wave distortions correspond to time distortions due to relativistic effects such as speed or gravitational potential difference, besides, relative time between clock frequencies relativistic effects causes clock error, so time distortion is misrepresented as time dilation.


Relative time emerge from relative frequencies. A phase shift in relative frequency results in an infinitesimal loss of wave energy, and a corresponding enlargement in the wavelength of oscillation can lead to errors in clock time readings between relative locations due to differences in velocity or gravitational potential.

The phase shift in relative frequencies refers to a change in the timing or synchronization of oscillations between two clocks in different relative locations. This can occur due to factors such as differences in velocity or gravitational potential. As a result, there can be a discrepancy or error in the measurement of time between the clocks.

The wavelength, as a spatial property, can be affected by these factors and undergo distortion or enlargement. However, it's important to note that the wavelength itself does not directly represent clock time. Rather, it is the timing or synchronization of the oscillations that is relevant for measuring time.

The time-related distortion, which represents the temporal aspects of the phenomenon, can be influenced by the phase shift and changes in wavelength. This can lead to errors in the reading of clock time between relative locations.

A phase shift refers to the displacement of a wave form in time. A complete wave cycle, also known as a period (T), corresponds to a phase shift of 360 degrees or 2π radians.

When representing a complete wave cycle in degrees (°), it can be denoted as T(deg). In this notation, T(deg) represents the angular measure of one complete cycle of the waveform in degrees.

In terms of frequency (f), which represents the number of wave cycles per unit of time, there is an inverse relationship between the period and the frequency. The period (T) is the reciprocal of the frequency (f), and the relationship can be expressed as: 

T = 1 / f

If we express the period in degrees, T(deg), the relationship still holds:

T(deg) = 360° / f

In this case, T(deg) represents the angular measure of one complete cycle of the waveform in degrees, and it is inversely proportional to the frequency (f).

Phase shifts can occur under the effects of relative velocities of observers and gravitational potential differences. These effects can introduce changes in the perception of time and the behavior of clocks, which may manifest as phase shifts in oscillatory systems and cause errors in time between relative clock oscillations under the effects of both relative velocities and gravitational potential differences.

Experiments made in electronic laboratories on piezoelectric crystal oscillators show that the wave corresponds to time shift due to relativistic effects. We get the wavelength λ of a wave is directly proportional to the time period T of the wave, that is λ ∞ T, derived from the wave equation f = v/λ = 1/T = E/h, where h is Planck constant and f, v, λ, T and E represent frequency, velocity, wavelength, time period and Energy of the wave respectively.

The frequency and wavelength are indirectly proportional to each other, f = 1/λ.

The frequency of a wave multiplied by its wavelength gives the speed of the wave, fλ = v or, f = v/λ.

The frequency is inversely proportional to the time period of the wave, f = 1/T.

The frequency of a wave is directly proportional to the energy of the wave, f = E/h, where h is Planck constant.

• Combined Equation given by f = v/λ = 1/T = E/h.

Where f, v, λ, T and E represent frequency, velocity, wavelength, time period and Energy of the wave respectively,

• The wavelength of a wave is directly proportional to the period of the wave, λ ∞ T.

The instantaneous phase (ϕ) represents an angular shift between two relative sine waves and is measured in degrees. After a time Δt, the two relative sine waves are initially synchronized in phase but differ in frequency by Δω degrees per second, developing a differential total phase shift (ΔΦ). Where Φ is the total phase shift accumulated over a period of time (Δt) and ω(t) is the frequency shift that may vary as a function of time. The total accumulated phase shift (Φ) can be thought of as the area under a frequency vs time curve.

• Equation given by: ΔΦ = Δω × Δt.  

The time interval T(deg) for 1° of phase is inversely proportional to the frequency (f). We get a wave corresponding to the time shift.

• 1° phase shift = T/360; T = 1/f.

• 1° phase shift = T/360 = (1/f)/360.

• A wave frequency = 5 Mhz. we get the phase shift (in degree°) corresponding time shift.

• 1° phase shift on a 5 MHz wave = (1/5000000)/360 = 5.55 x 10ˉ¹º = 555 ps. Corresponds to a time shift of 555 picoseconds

Therefore, for 1° phase shift for a wave having a frequency 5 MHz., and so wavelength 59.95 m, the time shift Δt is 555 ps. 

Time shift of the caesium-133 atomic clock in the GPS satellite: The GPS satellites orbit at an altitude of about 20,000 km. with a time delay of about 38 microseconds per day.

For 1455.50° phase shift or, 4.04 cycles of a 9192631770 Hz wave; time shifts Δt = 0.0000004398148148148148 ms. or, 38 microsecond time is taken per day.

Concluding that the equation for time dilation, t' = t / √ (1 - v²/c²) is incorrect and fails to explain the cause of time distortion, whereas, the phase shifts can occur and cause errors in time between relative clock oscillations under the effects of both relative velocities and gravitational potential differences; it is actually error in clock time due to relativistic effects, misrepresented as time dilation.

Reference Paper : Relativistic effects on phaseshift in frequencies invalidate time dilation II